A weekend Base jumping accident in a Utah canyon killed two people, one of them a daredevil athlete best known for performing onstage with Madonna at the 2012 Super Bowl, authorities said.

The sheriff’s office in Grand county, Utah, confirmed one of the dead was Andy Lewis, an extreme athlete known for feats in Base jumping, a dangerous sport that involves parachuting to the ground after jumping from a tall fixed object such as a building, a bridge or a desert cliff overlooking a deep canyon.

Lewis was also a prominent figure in the niche sports of slacklining and tricklining, which combine elements of high-wire walking with aerial acrobatics – sometimes at perilous heights.

Lewis went from obscure athlete to overnight celebrity when he appeared onstage in Madonna’s 2012 Super Bowl half-time show. Dressed in a Roman toga, Lewis bounced and executed tricks on his inch-wide line like it was a trampoline while Madonna sang behind him.

“My phone actually rang itself to death three days in a row,” Lewis said soon after in an appearance on Conan O’Brien’s late-night show.

Emergency responders were dispatched on Sunday to a report of people injured in a Base jumping attempt at Mineral Bottom, a remote desert area near the Utah-Colorado line, according to the sheriff’s office. Lewis and an unidentified 50-year-old man died at the scene, the sheriff’s office said in a news release.

Sheriff’s Lt Al Cymbaluk confirmed to the Associated Press that it was Lewis who died. He said he had no further details on the fatal accident.

Lewis owned Base Jump Moab, a business that offered excursions to inexperienced customers using tandem jumps, in which the customer was harnessed to a guide wearing the parachute.

At the same time, Lewis openly acknowledged the sport’s inherent danger.

“It’s weird to think about how many people are dead, because it’s like a normal thing,” Lewis told documentary film-maker Ella Warnick in an interview published last year.

No one immediately returned phone, text and Facebook messages left on Monday for Base Jump Moab.

Lewis won four straight world championships in competitive slacklining from 2008 through 2011. Lewis set a Guinness World Record for slackline surfing, swaying his feet side to side in a rocking motion that mimics surfing, while keeping his balance above China’s Diaoshuilou waterfall in 2011.

In 2014, he walked a slackline suspended between two hot air balloons more than 4,000ft (1,200 meters) above the Nevada desert.